<template>
  <div class="app">
    <h3>我是App组件</h3>
    <Suspense>
      <template v-slot:default>
        <Child/> 
      </template>
      <template v-slot:fallback>
        <h3>加载中...</h3>
      </template>
    </Suspense>

  </div>
</template>

<script>
// import Child from './components/Child.vue'
import { defineAsyncComponent } from 'vue'  //静态引入

  const Child = defineAsyncComponent(()=>import('./components/Child'))  //动态引入，异步引入

  export default {
    name:'App',
    components:{Child},
  }
</script>

<style>
  .app {
    background-color: gray;
    padding: 10px;
}

</style>